JPH0896338A - Magnetic head device - Google Patents

Abstract

(57) [Abstract] [Purpose] The slider and the magnetic head chip have good mutual positional accuracy to improve the depth accuracy of the magnetic gap, and stable recording / reproducing characteristics and overwrite characteristics. To improve the quality. A magnetic head chip composed of a recording / reproducing magnetic head chip and an erasing magnetic head chip has a medium sliding surface on which a slanted portion 23 is formed by chamfering a part of the medium sliding surface.
24 is provided. On the other hand, correspondingly to this, a recess 25 that fits into the inclined portions 23 and 24 is provided on the slider back surface 4d on the side opposite to the medium sliding surface 4a of the slider 4.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic head device suitable for recording / reproducing information on / from a magnetic recording medium such as a flexible disk.

[0002]

2. Description of the Related Art A magnetic head device mounted on a floppy disk drive for recording and / or reproducing information signals on a flexible disk such as a floppy disk is a magnetic gap for recording / reproducing. It has been proposed to hold a recording / reproducing magnetic head chip having a magnetic recording medium and an erasing magnetic head chip having a magnetic gap for erasing by a slider made of non-magnetic ceramics.
In this magnetic head device, since the magnetic head chip is held by the slider, the wear resistance of the magnetic head chip with respect to the medium can be improved and the running stability with respect to the medium can be ensured.

An example of the magnetic head device as described above is shown in FIG. Such a magnetic head device has a recording / reproducing magnetic head chip 101 having a recording / reproducing magnetic gap g ₁ facing the medium sliding surface 101a and forming a closed magnetic path, and an erasing magnetic gap g ₂ facing the medium sliding surface 102a. And a magnetic head chip 103 composed of an erasing magnetic head chip 102 having a closed magnetic path and a medium sliding surface 104a also in sliding contact with the medium, and a chip insertion hole 105 provided in the center of the medium sliding surface 104a. And a slider 104 having

In this magnetic head device, the magnetic head chip 103 is fixed in the chip insertion hole 105 so that the magnetic head chip 103 is held by the slider 104, the wear resistance to the medium is improved, and the traveling stability to the medium is stabilized. Sex is ensured. In FIG. 6, in order to make the structure of the magnetic head device easy to understand, the back core and the coil bobbin forming the recording / reproducing magnetic head chip 101 and the erasing magnetic head chip 102 are omitted and only the front core is shown.

Besides, a magnetic head device having a structure as shown in FIG. 7 has also been proposed. This magnetic head device also basically has the same configuration as the magnetic head device shown in FIG. That is, the recording / reproducing magnetic head chip 111 having a recording / reproducing magnetic gap g ₁ facing the medium sliding surface 111a and forming a closed magnetic path, and the erasing magnetic gap g ₂ facing the medium sliding surface 112a are closed magnetic. Magnetic head chip 113 consisting of erasing magnetic head chip 112 forming a path
And a slider 114 having a chip insertion hole 115 facing a medium sliding surface 114a which also slides against the medium.

In this magnetic head device, compared with the magnetic head device shown in FIG. 6, the medium sliding surfaces 111a, 112a of the magnetic head chips 111, 112 are longer in the front-rear direction which is the medium sliding direction, and both end edges thereof are longer. Is exposed on the side surface of the slider 114. Note that, in FIG. 7, as in FIG. 6, the back core and the coil bobbin forming the recording / reproducing magnetic head chip 111 and the erasing magnetic head chip 112 are omitted, and only the front core is shown.

The magnetic head device having the structure shown in FIG. 6 is manufactured as follows.

First, as shown in FIG. 8, the magnetic gap g ₁ for recording and reproduction facing the surface 121a which will be the medium sliding surface (hereinafter referred to as the medium sliding surface 121a) and the erasing by the polishing process in the subsequent process. A front core chip 121 having a magnetic gap g ₂ for use is prepared.

The front core chip 121 is connected to the back core on the side opposite to the medium sliding surface 121a, and a leg portion 121b for fitting a coil bobbin around which a driving coil is wound to form a closed magnetic circuit, 121c, 1
21d. As shown in FIG. 9, in this front core chip 121, a recording / reproducing front core 122 having a recording / reproducing magnetic gap g ₁ and an erasing front core 135 having an erasing magnetic gap g ₂ are nonmagnetic materials. It is joined by the fused glass 134.

The recording / reproducing front core 122 has a side core 125 and a center core 126 which are abutting surfaces 1.
It is configured by joining and integrating with a magnetic gap g ₁ between 25a and 126a. The side core 125 has an abutting surface 125a side, which is filled with a fused glass 128 for joining and unifying, and a winding groove 127 for restricting the depth of the magnetic gap g ₁ is provided. The tip 127a of the winding groove 127 serves to regulate the depth zero position of the magnetic gap g ₁ .

That is, the distance from the surface 125b (hereinafter referred to as the medium sliding surface 125b) which becomes the medium sliding surface by the polishing process of the side core 125 in the subsequent process to the tip 127a of the winding groove 127 is indicated by d in the figure. Distance is side core 125
And abutting surfaces 125a and 126 of the center core 126
It becomes the depth of the recording / reproducing magnetic gap g ₁ formed between a (hereinafter referred to as the depth d).

Also, a part of the side core 125 is a leg portion 12.
1b, and the portion where the center core 126 and the center core 130 of the erasing front core 135 described later are joined functions as the leg portion 121c.

On the other hand, the erasing front core 135 is also constructed by joining and integrating the side core 129 and the center core 130 with a magnetic gap g ₂ . On the abutting surface 129a side of the side core 129,
The winding groove 132 is filled with the fused glass 131 for joining and unifying, and regulates the depth of the magnetic gap g _2.
Is provided. The tip portion 132a of the winding groove 132
Also serves to regulate the depth zero position of the magnetic gap g ₂ . Also, this side core 1
A part of 29 functions as a leg portion 121d of the magnetic head chip.

The side core 1 of the recording / reproducing front core 122 of the front core chip 121 as described above.
The back height (hereinafter referred to as the back height H1), which is the vertical distance indicated by H1 in the drawing, from the tip portion 127a of the winding groove 127 provided in No. 25 to the bottom surface 125c of the side core 125 is measured.

Next, as shown in FIG. 10, by a polishing process in a subsequent step, the medium sliding surface 124a (hereinafter referred to as the medium sliding surface 124a) is penetrated to the back surface on the opposite side, and A slider 124 having a chip insertion hole 123 large enough to insert the front core chip 121
To prepare.

The slider 124 has legs 124b and 1b extending in the opposite side of the medium sliding surface 124a along both side edges of the chip insertion hole 123 in the longitudinal direction.
24c.

A glass setting groove 136 having a substantially U-shaped cross section is formed at a position corresponding to the chip insertion hole 123 on the medium sliding surface 124a. In other words, the bottom surface of the glass setting groove 136 is provided with the chip insertion hole 123 having a rectangular shape in plan view.

Then, as shown in FIG. 11, the front core chip 121 is attached to the chip insertion hole 1 of the slider 124.
The magnetic gaps g ₁ and g ₂ are inserted into the medium 23 from the side of the leg portions 121b, 121c and 121d so as to face the medium sliding surface 124a. At this time, the bottom surface 125c of the side core 125 that functions as the leg portion 121b and the bottom surfaces 124b ₁ and 124c ₁ of the leg portions 124b and 124c of the slider 124.
The front core chip 121 and the slider 124 are aligned so that they are flush with each other.

Then, as shown in FIG. 12, a fused glass 133 is placed in the glass setting groove 136 of the slider 124 and melted at a predetermined temperature. Then, the melted glass 133 is filled between the chip insertion hole 123 and the front core chip 121 to fix the front core chip 121 in the chip insertion hole 123.

Then, the medium sliding surface 1 of the slider 124
24a is polished to remove the glass setting groove 136 and the fused glass 133 filled in the glass setting groove 136. Then, the polishing is further advanced, and the slider 12
No. 4, the medium sliding surface 124a of the front core chip 121 exposed through the chip insertion hole 123 formed on the bottom surface of the glass setting groove 136 and the medium sliding surface 121a, and the magnetic gaps g ₁ and g ₂ are set to a predetermined depth. And

At this time, the front core chip 121
Is inserted into the chip insertion hole 123 of the slider 124, it is impossible to directly measure the depths of the magnetic gaps g ₁ and g ₂ .

Therefore, the magnetic gap g is set as follows.
Medium sliding surface 121a while measuring the depths of ₁ and g ₂ ,
The polishing of 124a is performed. As shown in FIG. 13, when the front core chip 121 is exposed from the chip insertion hole 123, the medium sliding surface 12 of the front core chip 121 is removed.
1a and the medium sliding surface 124a of the slider 124 are flush with each other, and the side core 125 of the front core chip 121 is
Bottom surface 125c and the legs 124b of the slider 124,
The bottom surfaces 124b ₁ and 124c _{1 of} 24c are flush with each other.

[0023] That is, the slider height which is the distance shown in the figure from the medium sliding surface 124a of the slider 124 to the bottom surface 124b ₁ H2 (hereinafter, slider referred to as height H2.) And the front core chip shown in FIG. 14 121
From the medium sliding surface 121a to the bottom surface 12 of the side core 125.
It is considered that the front core height (hereinafter referred to as the front core height H3), which is the vertical distance shown by H3 in the figure up to 5c, is the same.

The depth d of the magnetic gaps g ₁ and g ₂ is obtained by subtracting the previously measured back height H1 from the front core height H3. Therefore, by measuring the back height H1 in advance, measuring the slider height H2 that is the same as the front core height H3, and subtracting the back height H1 from the slider height H2, the magnetic gap g ₁ , The depth d of g ₂ will be calculated.

Therefore, the slider heights H2 are measured and the depths d of the magnetic gaps g ₁ and g ₂ are calculated, and the medium sliding surfaces 121a and 124a are polished. Next, the medium sliding surface 124a of the slider 124 is subjected to predetermined groove processing and chamfering processing for stable sliding with the medium, and the front bobbin 121 and the coil bobbin around which the driving coil is wound are mounted on the front chip core 121. A magnetic head device as shown in FIG. 6 is completed by incorporating a core and the like.

The same applies when the magnetic head device shown in FIG. 7 is manufactured. First, as shown in FIG. 15, there are a recording / reproducing magnetic gap g ₁ and an erasing magnetic gap g ₂ facing the medium sliding surface 141a, and leg portions 141b, 141c, 141d are provided on the side opposite to the medium sliding surface 141a. A front core chip 141 having the above is prepared. Also in the front core chip 141, a winding groove that restricts the depth of the magnetic gaps g ₁ and g ₂ is formed.

Then, the back height of the front core chip 141 is measured. However, in the front core chip 141, the medium sliding surface 141a is wider than the previous magnetic head in the gap length direction of the magnetic gaps g ₁ and g ₂ .

Next, it penetrates from the medium sliding surface 144a to the back surface side opposite to this, and also the front core chip 14 mentioned above.
A slider 144 having a chip insertion hole 143 of a size sufficient for inserting 1 is prepared. The slider 144 also has leg portions 144b and 144c at both side edge portions corresponding to the longitudinal direction of the chip insertion hole 143.

A glass setting groove 146 having a substantially U-shaped cross section is formed on the medium sliding surface 144a at a position corresponding to the chip insertion hole 143. In other words, the rectangular chip insertion hole 143 is formed on the bottom surface of the glass setting groove 146.

Next, the front core chip 141 is inserted into the chip insertion hole 143 of the slider 144 from the leg portions 141b, 141c, 141d side so that the magnetic gaps g ₁ , g ₂ face the medium sliding surface 144a. At this time, the bottom surface 145c of the side core 145 functioning as the leg portion 141b and the leg portions 144b and 144 of the slider 144 are formed.
The front core chip 141 and the slider 144 are aligned so that the bottom surfaces 144b ₁ and 144c _{1 of} c are flush with each other.

Then, the front core chip 141 is fixed in the chip insertion hole 143 of the slider 144 with fused glass, and the medium sliding surface 144a of the slider 144 is fixed.
Is polished until the front core chip 141 is exposed.
Further, polishing is continued to obtain a predetermined gap depth.

At this time, similarly to the magnetic head device described above, polishing is performed while measuring the slider height which is the same as the front core chip height and calculating the depths of the magnetic gaps g ₁ and g ₂ . Then, grooves on the medium sliding surface 144a of the slider 144 are processed to complete the magnetic head device as shown in FIG.

[0033]

In the magnetic head device having the above structure, the depth d of the magnetic gaps g ₁ and g ₂ is an extremely important factor because it greatly affects the recording / reproducing characteristics and the overwrite characteristics. Has been done. For example, in this type of magnetic head device, the depth d of the magnetic gaps g ₁ and g ₂ is ± 5 μm or less.

However, in the above magnetic head device, the depth accuracy of the magnetic gaps g ₁ and g ₂ is not very good, and the recording and reproducing characteristics and the overwrite characteristics are not stable. The reason will be described below.

In manufacturing the magnetic head device as described above, the back height H1 of the front core chip 121 is measured in advance as described above. Then, the bottom surface 125 c of the side core 125 that functions as the leg portion 121 b of the front core chip 121 and the leg portion 1 of the slider 124.
After aligning the bottom surface 124b ₁ of 24b, these are fixed by the fused glass 133. Then, polishing is performed until the medium sliding surface 121a of the front core chip 121 and the medium sliding surface 124a of the slider 124 are flush with each other, and then the slider height H2, which is the same as the front core height H3, is measured to determine the magnetic field. Polishing is continued until a predetermined depth is obtained while calculating the depth d of the gaps g ₁ and g ₂ .

In such a processing method, the magnetic gap g
The depth accuracy of ₁ and g ₂ depends on how much the front core height H3 and the slider height H2 match, that is, the mutual positional accuracy between the front core chip 121 and the bottom surfaces 125c and 125b ₁ of the legs of the slider 124. To do.

When the slider 124 and the front core chip 121 are fixed by the fused glass 133 as described above, the mutual positional accuracy between the front core chip 121 and the bottom surfaces 125c and 121b ₁ of the leg portions of the slider 124 is easily lowered, and the front A deviation occurs between the core height H3 and the slider height H2, and the depth accuracy of the magnetic gaps g ₁ and g ₂ is reduced.

The front core chip 121 is attached to the slider 1
In order to fix to 24, first, as shown in FIG. 16, the front core chip 121 is inserted into the chip insertion hole 123 of the slider 124 and the bottom surface 125c of the side core 125 and the leg portion 124b of the slider 124 which function as the leg portion 121b. , 124c are aligned with the bottom surfaces 124b1 and 124c _{1 of the same} . Then, the fused glass 133 is placed in the glass setting groove 136 and melted at a predetermined temperature. Then, the fused glass 133 is filled between the chip insertion hole 123 and the front core chip 121, and the front core chip 12 is inserted into the chip insertion hole 123.
1 is fixed.

In the joining step, however, due to the surface tension of the fused glass 133 and the contraction during solidification, the front core chip 121 causes the front core chip 121 to slide on the medium sliding surface 12 as shown in FIG.
4a side, the bottom surface 124 of the slider 124
A difference in the depth direction indicated by t1 in the figure occurs between c ₁ and the bottom surface 125c of the side core 125. Therefore, the front core chip 121 and the bottom surface 125c of each leg of the slider 124, the mutual position accuracy of 121c ₁ decreases, the depth accuracy of the magnetic gap g _1, g ₂ is reduced.

Further, as shown in FIG. 18, the front core chip 121 may be fixed in a state of being inclined with respect to the slider 124, and the bottom surfaces 124c ₁ and 12 of each leg portion may be fixed.
A difference occurs in the depth direction indicated by t2 in FIG. 5c. Therefore, the front core chip 121 and the bottom surface 125c of each leg of the slider 124, the mutual position accuracy of 121c ₁ decreases, the depth accuracy of the magnetic gap g _1, g ₂ is reduced.

The difference in position between the front core chip 121 and the bottom surfaces 125c and 121c ₁ of the legs of the slider 124 is as large as ten and several μm when large.
The dimensional tolerance of the depth d of the magnetic gaps g ₁ and g ₂ is ± 5μ
It is very difficult to keep it below m. Further, in such a magnetic head, the recording / reproducing characteristic and the overwrite characteristic are not stable. Further, from this, the manufacturing yield is not good and the productivity is not good.

Therefore, as shown in FIG. 19, a protrusion 152 abutting the leg 151c is provided on the leg 154c of the slider 154 at a position corresponding to the center leg 151c of the front core chip 151. A method of aligning the core chip 151 and the slider 154, fixing the leg 151c to the protrusion 152 with an adhesive 153, and then fixing the front core chip 151 to the slider 154 with a fused glass 155 has been proposed. There is.

However, when an organic adhesive is used as the adhesive 153, workability is good, but
At the fusing temperature of the fusing glass 155, the organic adhesive burns, and the front core chip 151 moves the slider 15
4 is no longer fixed, and slider 15
4 and the bottom surface of each leg of the front core chip 151 are displaced relative to each other. Further, when an inorganic adhesive is used as the adhesive 153, the heat resistance is good, and therefore the above-mentioned inconvenience does not occur.

However, there are no methods for removing inorganic adhesives after curing, and many of them become powdery.
Therefore, when the manufactured magnetic head is mounted on a floppy disk drive or the like, the powder of the adhesive may fall into the device during use, and an accident such as a head crash is likely to occur.

As shown in FIG. 20, the slider 162 is provided with a protrusion 162 abutting the leg 161c at a position corresponding to the leg 161c at the center of the front core chip 161.
4 is provided on the leg portion 164c of the front core chip 1
61 and the slider 164 are aligned, the leg portion 161c is fixed to the protrusion 162 by the spring 163, and then the front core chip 161 is fixed by the fused glass 165.
A method for fixing the slider to the slider 164 has also been proposed.

However, in the above method, although the front core chip 161 and the slider 164 are fixed well, the spring 1 is provided for each magnetic head device.
Since it is necessary to incorporate 63 and requires a large number of man-hours, productivity is poor.

Therefore, the present invention has been proposed in view of the conventional situation, and the mutual positional accuracy between the slider and the magnetic head chip is good, the depth accuracy of the magnetic gap is good, and the recording / reproducing characteristics are good. It is an object of the present invention to provide a magnetic head device which has stable overwrite characteristics and a good manufacturing yield and productivity.

[0048]

In a magnetic head device according to the present invention, a slider is provided with a magnetic head chip that constitutes a closed magnetic path and has a magnetic gap on a medium sliding surface that is in sliding contact with a magnetic recording medium. The magnetic head chip and the slider are joined and integrated with fused glass by inserting them into the holes. And in this magnetic head device,
In order to improve the mutual positional accuracy between the slider and the magnetic head chip and the depth accuracy of the magnetic gap, an inclined portion is provided on a part of the medium sliding surface of the magnetic head chip. A concave portion that fits with the magnetic head chip is provided on the slider back surface opposite to the slider surface facing the medium sliding surface of the magnetic head chip.

It is desirable that the inclined portions provided on the magnetic head chip are provided at both end portions of the magnetic head chip in the medium traveling direction. Further, in this magnetic head device, the magnetic gap of the magnetic head chip has a recording / reproducing magnetic gap and an erasing magnetic gap.

[0050]

In the magnetic head device according to the present invention, an inclined portion is provided on the medium sliding surface of the magnetic head chip, and the inclination is formed on the slider back surface opposite to the slider surface facing the medium sliding surface of the magnetic head chip. The magnetic head chip is inserted into the chip insertion hole of the slider, and the inclined portion and the recess are fitted together, and these are fixed by the fused glass. Even if the magnetic head chip is pulled up to the medium sliding surface side due to the surface tension or contraction of the glass, it is not pulled up beyond the position where the inclined portion and the recess are fitted. Therefore, the mutual position of the slider and the magnetic head chip is not largely displaced, the mutual position accuracy of these is improved, and the depth accuracy of the magnetic gap is improved.

If the accuracy of the gap between the inclined portion and the concave portion is increased, the accuracy of the distance that the magnetic head chip is pulled up to the medium sliding surface side is increased, and the mutual positional accuracy of the slider and the magnetic head chip is further increased.

[0052]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Specific embodiments to which the present invention is applied will be described in detail below with reference to the drawings.

As shown in FIG. 1, the magnetic head device of the present embodiment has a recording / reproducing magnetic head chip 1 having a recording / reproducing magnetic gap g ₁ facing the medium sliding surface 1a and forming a closed magnetic path. Erase magnetic gap g ₂ facing the medium sliding surface 2a
And a slider 4 having a chip insertion hole 5 facing the medium sliding surface 4a.

The magnetic head chip 3 has a slider 4
It is inserted into the chip insertion hole 5 provided in, and is fixed by fused glass (not shown). By being held by the slider 4, the magnetic head chip 3 has improved wear resistance with respect to the medium and good running stability with respect to the medium.

In FIG. 1, the back core and the coil bobbin incorporated in the recording / reproducing magnetic head chip 1 and the erasing magnetic head chip 2 are not shown in order to make the structure of the magnetic head device easy to understand. .

As shown in FIG. 2, the magnetic head chip 3 is composed of a front core chip 11, a back core and a coil bobbin (not shown). The front core chip 11 has a recording / reproducing magnetic gap g ₁ facing the medium sliding surface 11 a and an erasing magnetic gap g ₂ and a cross section having leg portions 11 b, 11 c, 11 d for forming a magnetic circuit portion. It is formed in a substantially E shape. The front core chip 11 is connected to the back core on the side opposite to the medium sliding surface 11a, and the coil bobbin around which the driving coil is wound is fitted to form a closed magnetic circuit.

In the front core chip 11, the recording / reproducing front core 12 having the recording / reproducing magnetic gap g ₁ and the erasing front core 13 having the erasing magnetic gap g ₂ are fused glass made of a non-magnetic material. It is joined by 14.

In the recording / reproducing front core 12, a side core 15 having a substantially L-shaped section and a center core 16 having an I-shaped section have a magnetic gap g ₁ between their abutting surfaces 15a, 16a, and are integrally joined. It has been transformed into
The butt surface 15a side of the side core 15 is filled with a fused glass 18 for joining and unifying, and a winding groove 17 for restricting the depth of the magnetic gap g ₁ is provided. The tip portion 17a of the winding groove 17 serves to regulate the depth zero position of the magnetic gap g ₁ .

That is, the medium sliding surface 1 of the side core 15
The vertical distance indicated by D in the figure in the gap depth direction from 5b to the tip 17a of the winding groove 17 is the side core 1
Abutting surface 15a of the 5 and the center core 16, a recording reproducing magnetic gap g ₁ of the depth which is formed between 16a (hereinafter, referred to as depth D.) Become.

Further, a part of the side core 15 has a leg portion 11b.
The portion where the center core 16 and the center core 20 of the erasing front core 13 which will be described later are joined functions as the leg portion 11c.

Similarly, the other erasing front core 13 has a structure in which the side core 19 and the center core 20 are joined and integrated with each other with a magnetic gap g ₂ . The butt surface 19a side of the side core 19 is filled with a fused glass 21 for joining and unifying, and a winding groove 22 for restricting the depth of the magnetic gap g ₂ is provided. The tip 22a of the winding groove 22 also serves to regulate the depth zero position of the magnetic gap g ₂ . Further, a part of the side core 19 functions as the leg portion 11d.

In particular, in this embodiment, inclined portions 23 and 24 are formed by notching a part of the medium sliding surface 11a at both end edges of the medium sliding surface 11a of the front core chip 11 in the medium running direction. It is provided. The inclined portions 23, 24 are inclined surfaces formed by obliquely cutting out the edge portions of the side cores 15, 19 provided on both sides of the center core 16 with the center core 16 interposed therebetween.

On the other hand, the slider 4 has a chip insertion hole 5 penetrating from the medium sliding surface 4a, which is the slider surface, to the back surface of the slider on the opposite side, and having a size sufficient to insert the front core chip 11. ing. The slider 4 has leg portions 4b and 4c extending to the opposite side to the medium sliding surface 4a at both side edge portions of the chip insertion hole 5 in the longitudinal direction.

As shown in FIGS. 1 and 3, the slider 4 has a side opposite to the medium sliding surface 1a of the magnetic head chip 3 which faces the chip insertion hole 5 of the slider 4,
That is, the front core chip 1 is attached to the back surface 4d of the slider.
A recess 25 is provided to be fitted into each of the inclined portions 23 and 24.

When the front core 11 is inserted into the chip insertion hole 5 of the slider 4, these recesses 25 are minute gaps (hereinafter referred to as the side core 15 side) between the inclined portions 23 and 24 and the recess 25 as shown in FIG. Gap a ₁ , side core 1
The gap on the 9 side is referred to as a gap a ₂ . ), The front core chip 11 is tilted and the position in the depth direction is regulated. Therefore, in the depth direction of the magnetic gap, the gap indicated by b in the figure, which is determined by the angle between the gap a and the inclined portion (hereinafter referred to as the side core 15
The gap on the side is the gap b ₁ , and the gap on the side core 19 side is the gap b ₁ .
Called ₂ . ) Is provided.

In this way, the magnetic head chip 3 is provided with the inclined portion 2
3 and 24 and corresponding recesses 25 for fitting the inclined portions 23 and 24 on the slider back surface 4d, the front core chip 1 is inserted into the chip insertion hole 5 of the slider 4.
When 1 is inserted and these are fixed by a fusion glass (not shown), even if the front core chip 11 is displaced due to the surface tension or contraction of the fusion glass, the inclined portions 23, 24
The concave portion 25 and the concave portion 25 do not deviate beyond the contact position, and the amount of deviation falls within the range of the clearances a and b.

Therefore, in the magnetic head device of this embodiment,
The mutual position of the slider 4 and the front core chip 11 is not largely displaced, and the mutual positional accuracy between them, in other words, the mutual positional accuracy of the slider 4 and the magnetic head chip 3 is improved, and the depth accuracy of the magnetic gaps g ₁ and g ₂ is improved. The recording characteristics and overwrite characteristics are stabilized.

Further, in this embodiment, the gap a in the chamfering direction of the inclined portions 23 and 24 is set to 5 μm, and the deviation of the front core chip 11 to the medium sliding surface side is ±.
It is designed to fit within 5 μm. That is, in the magnetic head device of this embodiment, the depth accuracy is ± 5.
It can be set to be not more than μm. The above accuracy can be sufficiently achieved by chamfering the head chip by machining in accordance with the slider 4 manufactured by injection molding or the like.

Then, by further improving the machining accuracy,
If the precision of the gap a between the inclined portions 23 and 24 and the recess 25 is increased, the mutual positional precision of the slider 4 and the front core chip 11 is further enhanced, and the depth precision of the magnetic gaps g ₁ and g ₂ is further enhanced, and recording is performed. The characteristics and overwrite characteristics are stable.

A method of manufacturing the magnetic head device of this embodiment will be described below.

First, as shown in FIG. 4, a front core chip 11 having a recording / reproducing magnetic gap g ₁ and an erasing magnetic gap g ₂ facing the surface 11a to be the medium sliding surface is prepared by polishing in a subsequent step. .

Next, the distance H1 in the figure of the front core chip 11, that is, the recording / reproducing front core 12 is shown.
17 of the winding groove 17 provided in the side core 15 of the
A back height (hereinafter, referred to as back height H1) that is a vertical distance from a to the bottom surface 15c of the side core 15 is measured.

Next, as shown in FIG. 4, the slider back surface 4 from the surface 4a which becomes the medium sliding surface by the polishing process in the subsequent step.
A slider 4 having a chip insertion hole 5 penetrating d and having a size sufficient for inserting the front core chip 11 is prepared. A glass set groove 26 having a substantially U-shaped cross section is formed in the slider 4 at a position corresponding to the chip insertion hole 5.

Then, the chip insertion hole 5 of the slider 4 is inserted.
The magnetic gaps g ₁ and g _{2 of the} front core chip 11
The front core chip 11 is covered with the slider 4 so that the front core chip 11 faces the medium sliding surface 4a, and the inclined portion 23 of the front core chip 11 is inserted into the recess 25 provided in the slider 4.
24 is fitted. Further, at this time, the bottom surface 15c of the side core 15 functioning as the leg portion 11b and the slider 4 are
The front core chip 11 and the slider 4 are aligned so that the bottom surfaces 4b ₁ and 4c ₁ of the leg portions 4b and 4c are flush with each other.

Next, as shown in FIG. 5, a fused glass 27 is placed in the glass setting groove 26 of the slider 4 and melted at a predetermined temperature. Then, the molten fusion glass 27 is filled between the chip insertion hole 5 and the front core chip 11, and the front core chip 1 is inserted into the chip insertion hole 5.
1 is fixed.

At this time, due to the surface tension or contraction of the fused glass 27, the front core chip 11 moves the medium sliding surface 4
Although it may be pulled up to the a side, the inclined portion 23,
24 and the recess 25 are not pulled up beyond the position where they are completely fitted together, and the amount of deviation in the depth direction falls within the range of the gap b. Therefore, the mutual position of the slider 4 and the front core chip 11 does not greatly shift,
The mutual positional accuracy, in other words, the mutual positional accuracy of the slider 4 and the magnetic head chip 3 is improved.

Subsequently, the medium sliding surface 4a of the slider 4 is ground to polish the glass setting groove 26 and the glass setting groove 2
The fused glass 27 filled in 6 is removed. Then, the polishing is further advanced, and the medium sliding surface 4a of the slider 4 is
And the medium sliding surface 11 of the front core chip 11 facing the chip insertion hole 5 formed in the bottom surface of the glass setting groove 26.
The magnetic gaps g ₁ and g ₂ are regulated to a predetermined depth by polishing a.

At this time, the depth D of the magnetic gaps g ₁ and g ₂ is measured by the same method as described above. A slider height to the bottom surface 4b ₁ from the medium sliding surface 4a of the slider 4, the front core chip 11 as shown in FIG. 4
The front core height (hereinafter referred to as the front core height H3), which is the distance H3 in the figure from the medium sliding surface 11a to the bottom surface 15c of the side core 15, is substantially the same.

Particularly, in manufacturing the magnetic head device of this embodiment, the slider 4 and the front core chip 1 are used.
The mutual position accuracy of 1 is considered to be good. Therefore,
It can be said that the slider height and the front core height H3 are substantially the same. Then, as shown in FIG. 4, the magnetic gap g
The depth D of ₁ and g ₂ is obtained by subtracting the previously measured back height H1 from the front core height H3.

Therefore, by measuring the slider height equivalent to the front core height H3 and subtracting the back height H1 from the slider height, the depth D of the magnetic gaps g ₁ and g ₂ can be calculated. The height of this slider is measured to calculate the depth D of the magnetic gaps g ₁ and g ₂ . At this time, since the slider height and the front core height H3 are substantially the same as described above, the depth D is calculated with good accuracy.

Next, the medium sliding surface 4a of the slider 4 is subjected to predetermined groove processing and chamfering processing for stable sliding with the medium, and the drive coil is wound around the front chip core 11. Built-in coil bobbin, back core, etc.
The magnetic head device as shown in FIG. 1 is completed.

[0082] In the magnetic head apparatus of this embodiment is fabricated in this way, since the magnetic gap g _1, g ₂ of the depth D is regulated while being accurate satisfactorily measured, the magnetic gap g _1, g ₂ Depth accuracy is improved, and recording characteristics and overwrite characteristics are stabilized. Furthermore, the manufacturing yield is good, and the productivity is also good. Further, if the magnetic head device of the present embodiment is manufactured by the manufacturing method as described above, the slider and the front core chip can be easily aligned, and the conventional manufacturing method can be easily manufactured without making a great change. It is possible to expect improvement in productivity.

[0083]

As is apparent from the above description, in the magnetic head device of the present invention, the medium sliding surface of the magnetic head chip is provided with the inclined portion which is a part of the medium sliding surface cut out. At the same time, since the recessed portion that fits with the inclined portion is provided on the slider back surface on the side opposite to the slider surface facing the medium sliding surface of the magnetic head chip, when fixing with the fused glass, the fused glass Even if the magnetic head chip is pulled up to the medium sliding surface side due to surface tension or contraction, it will not be pulled up beyond the position where the inclined portion and the recess fit.

Therefore, the mutual position of the slider and the magnetic head chip is not largely displaced, the mutual positional accuracy of these is improved, the depth accuracy of the magnetic gap is increased, and the recording / reproducing characteristics and the overwrite characteristics are stabilized. Further, if the accuracy of the gap between the inclined portion and the recess is increased, the accuracy of the distance that the magnetic head chip is pulled up to the medium sliding surface side is increased, the mutual positional accuracy of the slider and the magnetic head chip is further increased, and the magnetic gap of the magnetic gap is increased. By further increasing the depth accuracy, the recording / reproducing characteristics and the overwrite characteristics can be made stable.

[Brief description of drawings]

FIG. 1 is a perspective view showing a magnetic head device to which the present invention is applied.

FIG. 2 is a side view showing an example of a front core chip of a magnetic head device to which the present invention is applied.

FIG. 3 is a sectional view showing a magnetic head device to which the present invention is applied.

FIG. 4 is a perspective view sequentially showing a manufacturing process of a magnetic head device to which the present invention is applied, showing a process of covering a front core chip with a slider.

FIG. 5 is a side view showing the steps of manufacturing the magnetic head device to which the present invention is applied in sequence, showing the step of disposing the fused glass in the glass set groove.

FIG. 6 is a perspective view showing an example of a conventional magnetic head device.

FIG. 7 is a perspective view showing another example of a conventional magnetic head device.

8 is a perspective view showing a manufacturing process of the magnetic head device shown in FIG. 6 in order and showing a front core chip forming process. FIG.

9 is a side view showing a front core chip forming step, showing the manufacturing steps of the magnetic head device shown in FIG. 6 in order.

FIG. 10 is a perspective view showing a slider forming step in the order of steps of manufacturing the magnetic head device shown in FIG. 6;

FIG. 11 is a perspective view showing the steps of manufacturing the magnetic head device shown in FIG. 6 in order and showing the step of inserting the front core chip into the chip insertion hole of the slider.

FIG. 12 is a perspective view showing a step of manufacturing the magnetic head device shown in FIG. 6 in order, showing a step of disposing a fused glass in a glass set groove.

FIG. 13 is a perspective view showing a polishing step, showing the manufacturing steps of the magnetic head device shown in FIG. 6 in order.

FIG. 14 is a side view showing the manufacturing process of the magnetic head device shown in FIG. 6 in order and showing the relationship among depth, front core height, and back height.

FIG. 15 is a perspective view showing the steps of manufacturing the magnetic head device shown in FIG. 7 in order, and is a perspective view showing a step of inserting the front core chip into the chip insertion hole of the slider.

FIG. 16 is a cross-sectional view showing a step of disposing fused glass in the glass setting groove of the slider.

FIG. 17 is a cross-sectional view showing a state where the front core chip is pulled up to the medium sliding surface side of the slider.

FIG. 18 is a cross-sectional view showing a state in which the front core chip is fixed while being inclined with respect to the slider.

FIG. 19 is a cross-sectional view showing an example of a method of fixing the legs of the front core chip to the protrusions of the slider.

FIG. 20 is a cross-sectional view showing another example of the method of fixing the leg portion of the front core chip to the protrusion portion of the slider.

[Explanation of symbols]

 1 magnetic head chip for recording / reproducing 2 magnetic head chip for erasing 3 magnetic head chip 4 slider 5 hole for inserting chip 11 front core chip 12 front core for recording / reproducing 13 front core for erasing 23, 24 inclined portion 25 concave portion

Claims (3)

[Claims] 1. A magnetic head chip having a closed magnetic path and having a magnetic gap on a medium sliding surface that is in sliding contact with a magnetic recording medium is inserted into a chip insertion hole provided in a slider, and these magnetic head chip and slider are inserted. In a magnetic head device in which the above are joined and integrated with a fused glass, an inclined portion is provided on a part of the medium sliding surface of the magnetic head chip, and a concave portion that fits with the inclined portion is formed on the medium sliding surface of the magnetic head chip. A magnetic head device characterized in that the magnetic head device is provided on the slider back surface opposite to the slider surface facing the moving surface. 2. The magnetic head device according to claim 1, wherein the inclined portions are provided at both end portions of the magnetic head chip in the medium traveling direction. 3. The magnetic head device according to claim 1, wherein the magnetic gap of the magnetic head chip is a recording / reproducing magnetic gap and an erasing magnetic gap.